Blank-holding means



Aug.-1s, 1925. 1,550,579

R. E. sERvlsiT AL l BLANK HOLDING MEANS Filed nac. s, 1524 3 sheets-Shuts wmmwzs'efw -Patented Aug'. '18,... 1925 .UNITED STATESIPartnr'.LOFEICE.,

RAYMOND n siinLvIs AND FREDRICII J. BODEQOF CHICAGO, ILLINOIS,AssIGN'oRs To I MABQUETTE TOOL e une. oOIIrANY, or CHICAGO, ILLINOIS, Aoonrona'rIoN or ILLINOIS.

BLANx-HoLnINeMEANs.

Animation-nea necember'e, `1924, serial 110.754,348.

To all whbm t may concern: Be it known that we, RAYMOND E. SERvIs andvl1`RnDRIon-t J. RODE, citizens of the United- States, residingatChicago, in the county of Cook'and State of Illinois, have inventedcertain new and useful Improvements in Blank-Holding'Means,.of which thefollow v.ing is a specification.

This invention relates to fluid-pressure' cushions for use' in drawingin one operation, metal shapes or shells of a greater depth than isordinarilypossible to draw. in

one operation, and vis particularly adapted though not necessarilylimited' in its'use in 4action mechanical connection with what is termeda' singleress.

In presses of this character there is provided a plurality of ldrawrings or blank 'I holding means which, co-operate with the die,`theblank being held between the draw ring or hblank holding means and theram during the forming or shaping of the article. AThese draw rings vareusually arranged one Withfthe other, one Aof the'rings being held byiuidpressure, against operation while the other ring is moved during thefirst por- 4 the cycle of operation of the press in- Whichv ticle,

crank shaft and clutches and reduces the -tion of the cycl'eof operationof-formingor shaping .the blank lover the Stationary die and over theother die ring.` Y

After the complet-ion of the first portion' of the cycle of operationinforming or shaping the article, and during the same stroke fof theram, the article is further shaped over the stationary die, the innerdraw ring being then moved against the fluid pressure acting thereupon.

The'fluid pressure upon the inner draw ring must of necessity be ofsucha degree thatv the ring will not be moved during 'the first portionof the formation of the article, with the result that vduring thatportion of the inner draw ring is moved, the rammust overcome theefxcessfluid pressure to coinplete the formation or shaping ofthe ar-Thisresults in a strain upon the capacity or scope of the press'.

It is one 0f the objects of the present invention to overcome thesediic'ulties and ob-Y jections and to provide improved means topositively lock in' afixed position one ofthe blank holding membersor'draw rings whilel the other member or blank holding means is 'plateof a press,

allowed 'torremain movable under the action of the ram, and to provideimproved means for unlocking or releasing the locked inember to allowitto moveat a predetermined point or time in the cycle of operation ofthe press...4

A' further ,object is to provide improved in the features of novelty insubstantially the construction, combination and arrangement of theseveral parts hereinafter more fully described and claimed and shown in'the accompanying 'drawings illustrating thisinvention, and inwhich vFigure'l is a vertical, longitudinal sec tional view of a blank holdingmeans con- 4i `structed in-accordance with the principles of thisinvention and showing the parts in their initial `or starting position`in the .formation/ of the article; I

Fig. 2 isa view similar to Fig'. lvshowing the parts 'in anotherposition;

E Fig. 3' 1s-an enlarged. detail view taken on line 3-3, Fig. 1, of thelock-ing mechanism; and i Figa is alsectionalview takepfon line 4 4,Fig. 1.

Referring more particularlyto the drawings thenurneral l-'designates'the bolster having mounted thereupon astationaiy die member-11;, withwhich a.

cutting member 12 co-operates.v

(lo-operating with' the die is member 13 carried by. the -ram or. amovable part ofthel press,` and his die member 13 co-operates with themember 12 to out or shear the material 14.an d is so shaped that it willpass between the dies 11 and 12 to bolster 10.

. ASupported belovv the bolster' plate l1() is a another die bed plateorl shape the material over the die 11,- alll in a v. `manner aswellknown in this art.

the die 11' are-a' plurality.'4 blank holding members- I ster plate andalso pass through the plate or member 21. Nuts or collars 23 are carriedby these bolts 22 for holding the parts in position.l K

The end 24 of the cylinder 20 serves as a piston operating in thecylinder 19 and suitable packing 25 may be provided between the pistonand the cylinder.

'Operating in the cylinder 2() is a' piston 26 provided with suitablepacking rings '27. A piston rod 28 is connected with the piston 26 andpasses through the end 24 of the cylinder 20, suitable packing 29 beingprovided 'for the piston rod Wherexit passes through the cylinder head.24. This piston Vrod valso passes through the end 30 of the cylinder 19and a suitable packing 31 is provided for the piston at the point Whereit passes through the end of the cylinder 19. The cylinder 2O -isprovided with an inlet 32 to which is connected a supply pipe 33.thatreceives a suppl of fluid from any suitable source. The cy inder 19 isalso provided with an opening'v 34 yconnected with which is a suitablepipeA 35 adapted to be supplied with fluid from any suitable source, andboth of these openings 32 and 34 serve as outlets for the rcspectivecylinders so that the luid will flow into and out of the cylindersthrough the same respective openings'.

' The pins 18 which support the out-er draw ring or blank holdin member16 engage and rest upon the en 30 of the cylinderv 19, and the pins 17which support the inner draw ring or blank holding member l5 engage Aandrest upon'the end of the piston rod 28. It'desired a head or enlargement'36 may be provided on the end of the piston rod and against' which thepins 17l engage.

The piston rod 28 is provided with an extension 37 depending therebelowand which extension passes through the plate or member 21; therebeyond,and suitable packin 38 is provided for the extension 37 where 1t passesthrough the plate or'member 21.

Supported preferably by the plate 21 and depen ing therefrom is abracket 39, one end 40 of which is arran ed below' and in .alinementwith the.end Ao the extension '37 and is preferably bifurcated as at 41.Links 42 and 43 are pivotally connected by one end as at 44. .The freeend of the link 43 is pivotally connected as at 45 with the end 40 ofthe bracket' 39 and stands Within the bifurcationA 41. The free end ofthe link 42 projects into a bifurcation 46 in the lower extremity of theextension 37 of the piston rod 28 and is pivotally connected with theend ofthe extension 37 by means of a pivot pin 47. One end of the pinprojects later` ally beyond the extension 37 as at 48 and the extendedportion 48 of the pin nieves in a guide formed by means of a slot 49 inan extension 50 of the bracket 39 so as to guide the pin l48 in itsVertical movement.

The free end of the link 42 is loosely connected with the end of theextension 37, that is to say there is provided` a slot Y51 in the end ofthe link 42 to provide a slight lost motion between these parts and topermit the link 42 to have a properl movement during the operation ofthe device.

The links 42 are provided as a means for locking' the inner draw ring orblank holding member 15 against movement during the first portion of thecycle of operation of the machine and While the blank 14 is being formedover the die 11 and the blank holding member 15.

This is accomplished by reason of the fact that when the blankholdingmember or means 15 isin a position substantially flush with thetop of the die 11 the pivots 44-45 and 47 of the links Willbe arrangedin alinement.

In order to permit the movement of the blank holding means 15 during thecycle of operation of the press it, together with the piston rod 28 andextension 37, must be unlocked or released. This is accomplished bymoving the pivot 44 of the links 42 and 43 out of alinement with thepivots 45 and 47 so as to knuckle the links with respect to each other.This may-be accomplished in any desired or suitable manner butpreferably by means of a pin 52 which is slidably mounted upon thebracket 39 so as to move in directions transverse to the length of thelinks so as to engage the links on one side of the pivot 44 to exertpressure upon the links and cause them to knuckle. This pin 52 may beprovided with an adjustable head 53 held- -in its adjusted position bymeans of a suitable nut or collar 54. The pin 52 is of a length that theother end 55 thereof will eX`l tend beyond the bracket 39 andl ifdesired a shoulder 56 may be provided on the pin which is adapted toco-operate with a shoulder 57 to limit the movement of the pin in onedirection. l

An operating bar or rod 58 is provided for actuating the pin 52. Thisbar or rod 58 slides loosely through the plate 21 and j the bracket 39so that the extremity 59 thereof will engage the adjacent extremity ofthe pin 52. These contacting extremities of the pins 58 and 52 arepreferably rounded so as to facilitate and ,insure operation of thepin52 by the rod 58. The upper end' 'of the rod 58 passes loosely through abracket oreiztension '60 carriedby. the cylinder 19 and is threaded asat 61 to receive a -nut or collar 62, which latter is adapted toengage'and rest upon thebracket or extensionl 60 to support the rod 58.,An additional nut or collar 63 is provided on the rod 58 and 4is spacedfor a considerable distance from the nut or collar 62 and into and outof engagement with the nut Y or collar 63 the bracket or extension 60 onY' 52 forwardly to knuckle the links42 and 43 as shown in Figure 2. A 20the cylinder 19 is adapted to move during the operation of the press, y

. 4When the cylinder 19 is lowered the bracket' or'extension 60 engagesthe nut or collar 63 and lowers the rod. 58 and this movement of the rod58 will force the pin This operation takes place ]ust before the .'die,13 commences to force the blank holding means or member. 15 downwardlyto form the article over the die 11.

. At'the completion ofqthe 'operation ,of forming -the article and asthe cylinder I9 ascends the extension 60 will engage the nut or collar62 and raise the bar or rod 58 so as to release the. pin 52. As thepiston rod -so that the pivots 44, and 47 are in alinement, the pistonrod 28 will be again locked against operation.

.It is thought that the operation of. this apparatus will be' clearlyunderstood -from the foregoing, but briefly -stated it is as follows.The cylinder 19 and. piston 26 are held in their normal positions bymeans of fluid pressureadmitted into the cylinders and when in theposition shown in v19 and 20 from the source of iluid supply, Figure- 1,the blank holding means or member 15 will be locked against movement.

As the die 13 descends the first opera-tion will be the shearing of' themetal 14 by the die 13 and shearing member 12. .A Acontinplurality ofblank holding means adapted ued movement o'f the die 13 in agdownwa-rddirection will shape Athe material over the die 11 and blank holdingmember 15, the

latter being locked against operation. As 'the blank holdingmeans 16descends the pins 18-will lower the-cylinder 19 against '.the fluidpressure therein-and this operation will continue until the blankholding member'16y reaches thelimit of. its] downwardmovement. .Just atthis pointf in the cycle of operation vof'the machine the bracket-"orextension on the cylinder 19 wil1 engage the nut or collar 63 toforcethe' rod 58 .downwardly, the Vlatter forcing the pin 52 Y the.other blank holding means, locking means including a toggle, and meanslga s the link 42 it will -swing the links -42 an 43 about their pivots47 45 .to move the plvot 44out of alinement therewith. This Vwillknuckle theV links, 42 and 43 suiiiciently to release the piston rod 28and theblank holding means 15. v When thus eleased, a further movementof the die 13 in a downward-direction will shape the material 14 overthedie 11 and the blank holding means or member 15 will be depressed bythe die 13 against vthe Afluid pressure in the cylinder 20, through themedium of the pins 17.

This Will complete the operation of the forming of the article. A Whenthe ram or die 13 recedes'the cylinder 19 will be elevated by fluidpressure as will also the piston 27. This will return ,thel

draw vrings or blank holding members16-15 and will straightenthe links42 and 43 with respectto each other so as to move the pivot '44 Vthereofin alinement with the pivots45,A

and 47, thereby again-locking the vblank holding means or member 15against opera- 4 tion.

or member 15.

Obviously the nut or collar-63 may be ad While the preferred form-of theinvention has been herein shown and described it is to be understoodthat various changs may be made in the detailsofconstruction and in thecombination-and arrangement ofthe several parts, without departinginventio1 1.

'- `What is claimed as new is :--v

1.`A. draw press including a plunger, a plurality 'of blank holdingmeans adapted to successively co-operate with the plunger to clamp thework, means operable to posifrom' the spirit of this tively lock.l oneof the blank holding mean;

against operation during the operation o the other blank holding means,the said locking means including a toggle, and means for renderingl thelocking means inactive to release the blank holding means lockedthereby.

2. "A draw press 'including 'a plunger, a

within the scope of the claims,

to successively co-operate with the plunger .toplamp the work, meansoperable to positively lock one of the'blank holdingmeans againstoperation during the operation of' plurality of iuid pressure'contro ledlank 4lun er a v the said l holding means adapted to successively co-voperate with the plunger to clamp the work, means operable to Positivelylock one of the blank holding means against operation during theoperation of the other blank holding means, the said locking meansincluding a toggle-like device, and means operable to knuckle the saidtoggle-like device to release the blank holding means locked thereby.

4. A draw press including a plunger, a plurality of fluid pressurecontrolled blank holding means adapted to successively cooperate withthe' plunger to clamp the work, means operable to positively lock voneof the blank holding means against operation during the operation oftheotherblank holding means, the said locking means including a toggle-likedevice, and means controlled in its operation by the actuation of one ofthe saidl blank holding means for knucklng the said'toggle device torelease the blank holding means locked thereby.

5. A draw press including a plunger, a plurality of blankholding` meansadapted to successively co-operate with the plunger to clamp the Work, atoggle-like construction operatively connected with one of the blankholding means for locking the latter against operation during theoperation of the other blank holding means, and means responsive to theoperation of the blank holding means for knuckling the said toggle-likedevice to release the blank holding means locked thereby.

6. A draw press including a plunger, a plurality of blank holding meansadapted to successively co-operate with the plunger to clamp the Work, atoggle-like device operatively connected with one of the blank holdingmeans for locking the latter against operation during the operation ofthe other blank holding means, a plunger operable to knuckle the saidtoggle device to release the blank holding means locked thereby, and ashifting devlce adapted .to shift the plunger at a predetermined time inthe cycle of operation of the press.

7. A draw press including a plunger, a

a shifting device adapted to shift the saidl plunger at a predeterminedtime in the cycle of operation of the press, the said shifting devicebeing responsive in its operation to the operation of one of the saidblank holding means.

8. A draw press including a plunger, a plurality of blank holding meansadapted to successively co-operate with .the plunger to clamp the Work,a toggle-like device operatively connected with one of the blank holdingmeans for locking the latter against operation during the operation ofthe other blank holding means, a plunger operable to knuckle the saidtoggle device to release the blank holding means locked thereby, ashifting device adapted to shift the said plunger at a predeterminedtime in the cycle ot operation of the press, the said shifting de vicebeing responsive in its operation to the operation of one of the blankholding means, and means whereby the time of operation of the saidshifting device in the cycle of operation of the press may be varied. i

In testimony whereof We have signed our names to this specilication, onthis 28th day of November, A. D. 1924.

RAYMOND E. SERVIS. FREDRICH J. RODE.

